So I've just setup my new PC and upon turning it on for the first time all seemed to be working fine for the first two seconds, but then the computer shutdown and then started up again and then shutdown again two seconds later. This happens over and over. I unplugged everything from the motherboard one at a time to eliminate the possibility of faulty peripherals but the problem persisted. All my fans start up including the ones not connected to the motherboard and all my drives begin to spin but then everything dies and then starts up again.
My thoughts are either the CPU isn't seated right, the motherboard is short cuirciting or the power supply is not powerful enough. My specs are:
Gigabyte X58A UD3R
Intel Core i7 930
6GB of DDR3 1600 Memory
Nvidia GT220 Graphics Card
3x Seagate 500GB SATA HDD's
1 Sony Optiarc SATA DVD Burner
2x 120mm fans, one which is LED
1 230mm fan, also LED
This powered by a Thermaltake power supply with a total output of 400W and Peak output of 500W.
What do think is the most likley cause of this continuous start up and shut down problem is? Any ideas will be appreciated.